基于动态时间弯曲距离的主动配电网馈线差动保护

发布时间：2018-01-10 05:16

本文关键词：基于动态时间弯曲距离的主动配电网馈线差动保护　出处：《电工技术学报》2017年06期 　论文类型：期刊论文

【摘要】：基于馈线上不安装电压互感器、馈线终端(FTU)通信实时性较差和时间同步能力较弱的工程应用背景,提出一种主动配电网馈线差动保护方法。利用相电流突变量启动算法,触发馈线区段边界上各FTU相互交换1个工频周波的故障电流采样数据,再通过计算各FTU故障电流的动态时间弯曲(DTW)距离确定是否为区段内部故障。该保护在启动算法与抗同步误差能力强的DTW算法的配合下,不需要获取电压信息,不要求FTU间准确同步,对数据通信实时性要求不高,数据运算量小,对FTU硬件配置要求低,适用于分布式电源高度渗透的含多分支线路的主动配电网。仿真结果说明了所提方法的有效性。
[Abstract]:Based on the feeder line does not install voltage transformer, feeder terminal FTU communication is poor real-time and weak time synchronization ability of the engineering application background. This paper presents a method of feeder differential protection for active distribution network, which triggers the exchange of fault current sampling data of one power frequency Zhou Bo on each FTU on the boundary of feeder section by using the phase current mutation starting algorithm. By calculating the dynamic time bending distance of each FTU fault current, it is determined whether it is an internal fault of the section. The protection is coordinated by the start-up algorithm and the DTW algorithm which has strong ability of anti-synchronization error. It does not need to obtain voltage information, does not require accurate synchronization between FTU, the real-time requirements for data communication is not high, the data operation is small, and the FTU hardware configuration requirements are low. It is suitable for active distribution network with high penetration of distributed power supply with multi-branch lines. The simulation results show the effectiveness of the proposed method.
【作者单位】：湖南大学电气与信息工程学院;国网湖南省电力公司电力科学研究院;
【基金】：国家自然科学基金(51677060) 国家电网公司科学技术项目(5216A016000T)资助
【分类号】：TM773
【正文快照】： 0引言传统配电网多采用辐射型结构或开环运行的环网结构,线路一般配置按照单一潮流方向整定的电流保护。在主动配电网中,各种形式的分布式电源(Distributed Generation,DG)大量接入,配电网由原来的单电源辐射供电变为多电源联合供电[1],常规的无法辨别短路电流方向的电流保护

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